| 1 | Endesa Energia Sau | Spain | Madrid | Calle Ribera del Loira 60 | Madrid | 28042 | endesa.***** | 1998 | $16,083,995,552 | 1,088 | N/A | N/A | A81948077 |
| 2 | Iberdrola Clientes Sociedad Anonima. | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2014 | $12,006,686,743 | 968 | N/A | N/A | A95758389 |
| 3 | Engie España SL. | Spain | Madrid | Calle Ribera del Loira 28 | Madrid | 28042 | engie.***** | 1999 | $11,802,685,736 | 265 | N/A | N/A | B82508441 |
| 4 | Gas Natural Comercializadora SA | Spain | Madrid | Avenida San Luis 77 | Madrid | 28033 | tafonca.***** | 1998 | $6,050,677,958 | 658 | N/A | N/A | A61797536 |
| 5 | Naturgy Aprovisionamientos SA. | Spain | Madrid | Avenida San Luis 77 | Madrid | 28033 | naturgy.***** | 1999 | $5,852,460,774 | 105 | N/A | N/A | A82531062 |
| 6 | Endesa Generacion Sau | Spain | Sevilla | Avenida la Borbolla 5 | Sevilla | 41004 | endesa.***** | 1999 | $5,738,586,197 | 816 | N/A | N/A | A82434697 |
| 7 | Galp Energia España Sau | Spain | Alcobendas | Calle de Francisca Delgado (arroyo), 11 - Plt 4 Y 5 | Madrid | 28108 | galpenergia.***** | 1979 | $3,889,951,175 | 399 | N/A | N/A | A28559573 |
| 8 | Pavilion Energy Spain SA. | Spain | Madrid | Paseo Castellana (torre Cristal), 259 - C Planta 21 sur | Madrid | 28046 | N/A | 2019 | $3,278,033,477 | 50 | N/A | N/A | A88410493 |
| 9 | Iberdrola Energia España Sociedad Anonima. | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2014 | $3,003,363,963 | 147 | N/A | N/A | A95758371 |
| 10 | Axpo Iberia Slu | Spain | Madrid | Paseo Castellana 95 | Madrid | 28046 | energiapymes.***** | 2001 | $2,734,937,854 | 297 | N/A | N/A | B83160994 |
| 11 | Naturgy Iberia Sau | Spain | Madrid | Avenida America 38 | Madrid | 28028 | naturgy.***** | 1976 | $2,671,231,368 | 658 | N/A | N/A | A08431090 |
| 12 | Edistribucion Redes Digitales SL. | Spain | Madrid | Calle Ribera del Loira 60 | Madrid | 28042 | N/A | 2000 | $2,406,335,131 | 2,570 | N/A | N/A | B82846817 |
| 13 | I-De Redes Electricas Inteligentes Sociedad Anonima. | Spain | Bilbao | Avenida San Adrian 48 | Vizcaya | 48003 | iberdroladistribucionelectrica.***** | 2000 | $1,987,760,775 | 3,198 | N/A | N/A | A95075578 |
| 14 | Viroque Petroleum SL. | Spain | Madrid | Paseo Castellana, 96 - 2 Iz | Madrid | 28046 | N/A | 2021 | $1,950,878,548 | 20 | N/A | N/A | B67927061 |
| 15 | Union Electrica De Canarias Generacion SA | Spain | Las Palmas de Gran Canaria | Calle Albareda (pza. Woermann) 38 | Las Palmas | 35008 | N/A | 1998 | $1,870,432,377 | 561 | N/A | N/A | A35543263 |
| 16 | Iberdrola Generacion Sau | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2000 | $1,839,505,556 | 764 | N/A | N/A | A95075586 |
| 17 | Energia Xxi Comercializadora De Referencia SL. | Spain | Madrid | Calle Ribera del Loira 60 | Madrid | 28042 | endesa.***** | 2000 | $1,761,680,370 | 3 | N/A | N/A | B82846825 |
| 18 | Iberdrola Renovables Energia SA | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 1996 | $1,687,413,698 | 1,164 | N/A | N/A | A81428476 |
| 19 | Iberdrola Generacion Nuclear SA. | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2012 | $1,685,817,918 | 409 | N/A | N/A | A86583747 |
| 20 | Naturgy Ciclos Combinados Slu | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2021 | $1,621,923,285 | 335 | N/A | N/A | B42884122 |
| 21 | Nexus Energia, SA | Spain | Madrid | Paseo Castellana, 91 - P 2 | Madrid | 28046 | N/A | 2000 | $1,609,062,930 | 265 | N/A | N/A | A62332580 |
| 22 | Edp Clientes Sau | Spain | Oviedo | Plaza del Fresno 2 | Asturias | 33007 | edpenergia.***** | 2020 | $1,590,849,451 | 265 | N/A | N/A | A74472911 |
| 23 | Compañia De Gas Licuado Zaragoza SA | Spain | Madrid | Calle Juan Alvarez Mendizabal, 91 - Bajo C | Madrid | 28008 | N/A | 2002 | $1,494,279,168 | 456 | N/A | N/A | A83310946 |
| 24 | Red Electrica De España Sociedad Anonima | Spain | Alcobendas | Paseo del Conde de Los Gaitanes, 177 - 179 | Madrid | 28109 | ree.***** | 2007 | $1,476,644,951 | 1,567 | N/A | N/A | A85309219 |
| 25 | Siemens Gamesa Renewable Energy Eolica SL | Spain | Sarriguren | Avenida Ciudad de la Innovacion, 9 - 11 | Navarra | 31621 | siemensgamesa.***** | 2006 | $1,419,231,469 | 1,148 | N/A | N/A | B31907330 |
| 26 | Curenergia Comercializador De Ultimo Recurso Sociedad Anonima. | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2008 | $1,416,837,586 | 3 | N/A | N/A | A95554630 |
| 27 | Repsol Comercializadora De Electricidad Y Gas, Slu | Spain | Santander | Calle Isabel Torres 19 | Cantabria | 39011 | eonespana.***** | 2002 | $1,358,274,614 | 204 | N/A | N/A | B39540760 |
| 28 | Acciona Green Energy Developments SL | Spain | Madrid | Avenida Gran Via de Hortaleza 1 | Madrid | 28033 | acciona.***** | 2001 | $1,236,681,580 | 41 | N/A | N/A | B31737422 |
| 29 | Comercializadora Regulada, Gas & Power SA. | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2009 | $1,210,514,602 | 5 | N/A | N/A | A65067332 |
| 30 | Cepsa Gas Comercializadora SA | Spain | Madrid | Paseo Castellana (torre Cepsa) 259 | Madrid | 28046 | cepsa.***** | 1999 | $1,087,769,649 | 9 | N/A | N/A | A82485335 |
| 31 | Sagane SA | Spain | Madrid | Avenida San Luis 77 | Madrid | 28033 | N/A | 1994 | $1,077,756,106 | 5 | N/A | N/A | A80883580 |
| 32 | Totalenergies Clientes Sau | Spain | Oviedo | Plaza de Los Ferroviarios 1 | Asturias | 33012 | N/A | 1998 | $1,036,732,287 | 658 | N/A | N/A | A95000295 |
| 33 | Totalenergies Electricidad Y Gas España Sau | Spain | Madrid | Calle Ribera del Loira, 46 - Pta de Las Naciones | Madrid | 28042 | electricidad.***** | 2017 | $986,937,319 | 76 | N/A | N/A | A87803862 |
| 34 | Eni España Comercializadora De Gas SA. | Spain | Madrid | Calle Via de Los Poblados (- Pq. Empresarial Alvento) 1 | Madrid | 28033 | unionfenosagas.***** | 1999 | $939,660,366 | 63 | N/A | N/A | A82539594 |
| 35 | Ufd Distribucion Electricidad SA. | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2003 | $899,578,698 | 793 | N/A | N/A | A63222533 |
| 36 | Iberdrola Energia Sostenible España Sociedad Limitada. | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | torreiberdrola.***** | 2022 | $893,842,774 | 10 | N/A | N/A | B10984862 |
| 37 | Gas Y Electricidad Generacion SA | Spain | Palma | Calle Sant Joan de Deu 1 | Islas Baleares | 07007 | endesa.***** | 1998 | $806,392,150 | 280 | N/A | N/A | A07924079 |
| 38 | Repsol Generacion Ciclos Combinados, S.L. | Spain | Santander | Calle Isabel Torres 19 | Cantabria | 39011 | N/A | 2021 | $719,233,493 | 84 | N/A | N/A | B06787618 |
| 39 | Gesternova, SA | Spain | Madrid | Paseo Castellana 259 | Madrid | 28046 | gesternova.***** | 2005 | $686,801,626 | 73 | N/A | N/A | A84337849 |
| 40 | Alpiq Energia España SA | Spain | Madrid | Calle Orense, 34 - Piso 3 | Madrid | 28020 | alpiq.***** | 1999 | $671,173,890 | 265 | N/A | N/A | A82405788 |
| 41 | Edp España Sau | Spain | Oviedo | Plaza del Fresno 2 | Asturias | 33007 | clinicadentalh-c.***** | 1995 | $644,085,822 | 305 | N/A | N/A | A33473752 |
| 42 | Iberdrola Generacion Termica Sociedad Limitada | Spain | Bilbao | Plaza Euskadi 5 | Vizcaya | 48009 | iberdrola.***** | 2017 | $642,611,656 | 265 | N/A | N/A | B95924239 |
| 43 | Fortia Energia SL | Spain | Madrid | Calle Gregorio Benitez, 3 - B Plt 1, Modulo 1 | Madrid | 28043 | fortiaenergia.***** | 2007 | $617,468,346 | 15 | N/A | N/A | B85228138 |
| 44 | Eni Plenitude Iberia, Sociedad Limitada. | Spain | Santander | Calle Albert Einstein (ed Bisalia) 20 | Cantabria | 39011 | eniplenitude.***** | 2014 | $616,994,583 | 178 | N/A | N/A | B39793294 |
| 45 | Holaluz-Clidom S.A. | Spain | Barcelona | Paseo Don Joan Borbo Comte Barcelona, 99 - 101 Cuarta Planta | Barcelona | 08039 | holaluz.***** | 2010 | $600,846,688 | 436 | N/A | N/A | A65445033 |
| 46 | Iberdrola Redes España Sociedad Anonima Unipersonal | Spain | Bilbao | Avenida San Adrian 48 | Vizcaya | 48003 | iberdrola.***** | 2014 | $589,343,921 | 72 | N/A | N/A | A95758363 |
| 47 | Vestas Eolica SA | Spain | Madrid | Calle Serrano Galvache (pq. Norte. Ed Madroño) 56 | Madrid | 28033 | vestas.***** | 1996 | $586,026,983 | 1,019 | N/A | N/A | A61186623 |
| 48 | Naturgy Commodities Trading SA. | Spain | Madrid | Avenida San Luis 77 | Madrid | 28033 | N/A | 1899 | $568,680,215 | 3 | N/A | N/A | A08000606 |
| 49 | Holding De Negocios De Gas SA | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2007 | $524,700,467 | 1 | N/A | N/A | A64645021 |
| 50 | Fenie Energia, SA | Spain | Madrid | Calle Alsasua 20 | Madrid | 28023 | fenieenergia.***** | 2010 | $497,441,088 | 265 | N/A | N/A | A85908036 |
| 51 | Cepsa Gas Y Electricidad Sau | Spain | Madrid | Paseo Castellana, 259 - A. Torre Cepsa | Madrid | 28046 | cepsa.***** | 1964 | $493,454,383 | 67 | N/A | N/A | A28142552 |
| 52 | Ge Wind Energy SL | Spain | Noblejas | Carretera Nacional 400, Km 57 | Toledo | 45350 | gepower.***** | 2002 | $469,873,650 | 635 | N/A | N/A | B83299511 |
| 53 | Grenergy Epc Europa SL. | Spain | Madrid | Calle Rafael Boti, 26 - 2 | Madrid | 28023 | grenergy.***** | 2020 | $442,436,539 | 98 | N/A | N/A | B01906338 |
| 54 | Electricidad Eleia SL. | Spain | Madrid | Calle Via de Los Poblados, 11 - Torre C 3 Iz | Madrid | 28033 | N/A | 2018 | $421,480,614 | 50 | N/A | N/A | B88181441 |
| 55 | Central Termica Ciclo Combinado Grupo 4 SL | Spain | Oviedo | Plaza del Fresno 2 | Asturias | 33007 | edpenergia.***** | 2008 | $419,997,836 | 54 | N/A | N/A | B74233958 |
| 56 | Factor Energia SA | Spain | Barcelona | Avenida Diagonal, 575 - 2 Ed la Illa Modulo Ii Pl | Barcelona | 08029 | factorenergia.***** | 1999 | $418,118,907 | 273 | N/A | N/A | A61893871 |
| 57 | Nedgia SA. | Spain | Madrid | Avenida America 38 | Madrid | 28028 | nedgia.***** | 2015 | $408,644,356 | 456 | N/A | N/A | A66560152 |
| 58 | Audax Renovables S.A. | Spain | Badalona | Calle de L'Electronica, 19 - Planta 7, Pta. C | Barcelona | 08915 | audaxrenovables.***** | 2000 | $398,453,152 | 265 | N/A | N/A | A62338827 |
| 59 | Acciona Generacion Renovable SA. | Spain | Madrid | Avenida Gran Via de Hortaleza 1 | Madrid | 28033 | acciona.***** | 2002 | $395,731,126 | 922 | N/A | N/A | A31768138 |
| 60 | Naturgy Renovables Slu | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2004 | $395,157,957 | 368 | N/A | N/A | B84160423 |
| 61 | Nedgia Catalunya S.A. | Spain | Barcelona | Plaza Gas 2 | Barcelona | 08003 | nedgia.***** | 2004 | $383,766,481 | 456 | N/A | N/A | A63485890 |
| 62 | Union Electrica De Canarias SA | Spain | Las Palmas de Gran Canaria | Avenida Alcalde Jose Ramirez Bethencourt 22 | Las Palmas | 35004 | endesadistribucion.***** | 1998 | $371,638,755 | 3 | N/A | N/A | A35543255 |
| 63 | Asociacion Nuclear Asco Vandellos Ii Aie | Spain | Vandellòs | Carretera Nacional 340, Km 1123 | Tarragona | 43890 | anav.***** | 1986 | $370,644,067 | 905 | N/A | N/A | V58209685 |
| 64 | Naturgy Generacion Slu | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2014 | $331,542,506 | 113 | N/A | N/A | B86010766 |
| 65 | Oxigeno Soluciones Medicas SA | Spain | Gijón | Avenida Cordillera Cantabrica, 32 - 2 E | Asturias | 33204 | N/A | 2012 | $327,692,800 | 100 | N/A | N/A | A52502804 |
| 66 | Biocalidris Sociedad Limitada. | Spain | Granada | Avenida de la Constitucion, 24 - 7 A Dr | Granada | 18012 | N/A | 2021 | $327,692,800 | 100 | N/A | N/A | B06959878 |
| 67 | Probutano SL | Spain | València | Calle Professora Olimpia Arozena Torres 12 | Valencia | 46018 | N/A | 1961 | $327,692,800 | 100 | N/A | N/A | B46015558 |
| 68 | Es2250 Smartenergy Sociedad Limitada. | Spain | València | Plaza Ajuntament, 27 - Piso 4 | Valencia | 46002 | N/A | 2022 | $327,692,800 | 100 | N/A | N/A | B09796384 |
| 69 | Iberpropano Gas Natural Licuado Sociedad Anonima. | Spain | Zaragoza | Plaza Aragon (zaragoza), 3 - Plt 1 | Zaragoza | 50004 | N/A | 2017 | $327,692,800 | 100 | N/A | N/A | A99512980 |
| 70 | Tria Biometano Sociedad Limitada. | Spain | Sevilla | Calle Maestro Gomez Zarzuela, 6 - Bl 4 7 D | Sevilla | 41008 | N/A | 2025 | $327,692,800 | 100 | N/A | N/A | B21774658 |
| 71 | Es2131 Smartenergy Sociedad Limitada. | Spain | València | Plaza Ajuntament, 27 - Piso 4 | Valencia | 46002 | N/A | 2021 | $327,692,800 | 100 | N/A | N/A | B16983884 |
| 72 | Serapio Calvo SA Y Fernandez De La Mata Instalaciones Electricas SA Union Temporal De Empr | Spain | Torrelodones | Avenida Rosario 2 | Madrid | 28250 | N/A | 1995 | $327,692,800 | 100 | N/A | N/A | U81192379 |
| 73 | Energas Levante SL. | Spain | Almoradí | Avenida el Bañet 2 | Alicante | 03160 | N/A | 2025 | $327,692,800 | 100 | N/A | N/A | B22640858 |
| 74 | Consorcio Provincial Para La Gestion De Los Residuos Solidos Urbanos En La Provincia De LE | Spain | León | Avenida Real 1 | León | 24006 | gersul.***** | 1997 | $327,692,800 | 100 | N/A | N/A | P7490002H |
| 75 | Es2248 Smartenergy Sociedad Limitada. | Spain | València | Plaza Ajuntament, 27 - 4 | Valencia | 46002 | N/A | 2022 | $327,692,800 | 100 | N/A | N/A | B09796400 |
| 76 | Siroco Hydrogen 3 SL. | Spain | Madrid | Calle Alfonso Xii, 20 - Plt 1 | Madrid | 28014 | N/A | 2023 | $327,692,800 | 100 | N/A | N/A | B56845621 |
| 77 | Distribuidora Foranea De Gas SL | Spain | Inca | Calle Gloria 33 | Islas Baleares | 07300 | N/A | 1980 | $327,692,800 | 100 | N/A | N/A | B07117922 |
| 78 | Galicia Reciclado De Filtros SA | Spain | As Somozas | Lugar as Somozas | La Coruña | 15565 | N/A | 2002 | $327,692,800 | 100 | N/A | N/A | A15835440 |
| 79 | Universigas SL. | Spain | Salamanca | Calle Gran Via, 30 - 4 D | Salamanca | 37001 | N/A | 2003 | $327,692,800 | 100 | N/A | N/A | B37404233 |
| 80 | Ona Bizkaia Sociedad Limitada. | Spain | La Cuesta | Calle Kalero 2 | Vizcaya | 48508 | N/A | 2025 | $327,692,800 | 100 | N/A | N/A | B21702733 |
| 81 | Butan Gas S.P.A. | Spain | Madrid | Calle Antonio Acuña 19 | Madrid | 28009 | N/A | N/A | $327,692,800 | 100 | N/A | N/A | N0051678A |
| 82 | Escal Ugs SL | Spain | Madrid | Avenida Camino de Santiago 50 | Madrid | 28050 | N/A | 1998 | $327,692,800 | 100 | N/A | N/A | B81975385 |
| 83 | Montajes Industriales Europeos, S.L. | Spain | Constantí | Poligono Industrial Constanti, Nav 11, Parc 3 Y 4 | Tarragona | 43120 | N/A | 2025 | $327,692,800 | 100 | N/A | N/A | B22660153 |
| 84 | Enerkia Energia SL. | Spain | Sant Cugat del Vallès | Avenida Via Augusta (ed B 2), 15 - Fi. 13 | Barcelona | 08174 | N/A | 2015 | $327,692,800 | 100 | N/A | N/A | B66589904 |
| 85 | Medgaz SA | Spain | Almería | Lugar Muelle de Poniente (pto. de Almeria), S/n | Almería | 04002 | medgaz.***** | 2001 | $325,796,007 | 456 | N/A | N/A | A82916842 |
| 86 | Enel Green Power España Sociedad Limitada Unipersonal | Spain | Madrid | Calle Ribera del Loira 60 | Madrid | 28042 | enelgreenpower.***** | 1996 | $306,586,374 | 577 | N/A | N/A | B61234613 |
| 87 | Energya Vm Gestion De Energia Slu | Spain | Madrid | Calle Federico Mompou, 5 - Ed 1 Plta 4 | Madrid | 28050 | energyavm.***** | 2002 | $299,772,850 | 138 | N/A | N/A | B83393066 |
| 88 | Biodiesel Bilbao Sociedad Limitada | Spain | La Cuesta | Calle Punta Sollana, S/n | Vizcaya | 48508 | acciona-energia.***** | 2005 | $295,699,591 | 16 | N/A | N/A | B95407391 |
| 89 | Naturgy Clientes Sau | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2021 | $291,156,275 | 3 | N/A | N/A | A67760876 |
| 90 | Baser Comercializadora De Referencia SA. | Spain | Oviedo | Plaza de Los Ferroviarios 1 | Asturias | 33012 | N/A | 2009 | $290,410,395 | 3 | N/A | N/A | A74251836 |
| 91 | Unielectrica Energia SA | Spain | Córdoba | Avenida de la Arruzafilla 14 | Córdoba | 14011 | unielectrica.***** | 2012 | $288,446,221 | 265 | N/A | N/A | A14944276 |
| 92 | Soltec Energias Renovables Slu | Spain | Molina de Segura | Calle Gabriel Campillo Contreras (pg Ind. la Serreta), S/n | Murcia | 30500 | soltec.***** | 2004 | $284,602,704 | 497 | N/A | N/A | B73292161 |
| 93 | Contourglobal La Rioja SL | Spain | Arrúbal | Poligono Industrial Sequero (central Termica), S/n | La Rioja | 26151 | N/A | 2011 | $275,734,551 | 28 | N/A | N/A | B86172129 |
| 94 | Naturgy Generacion Termica Slu | Spain | Madrid | Avenida America 38 | Madrid | 28028 | N/A | 2021 | $254,204,831 | 20 | N/A | N/A | B05324538 |
| 95 | Ow Offshore SL | Spain | Madrid | Calle Cardenal Marcelo Spinola 42 | Madrid | 28016 | N/A | 2013 | $242,882,595 | 163 | N/A | N/A | B74344334 |
| 96 | Generacion Electrica Peninsular SA | Spain | Madrid | Paseo Castellana, 259 - A. Torre Cepsa | Madrid | 28046 | cepsa.***** | 2002 | $238,620,570 | 1 | N/A | N/A | A83491019 |
| 97 | Gonvarri Solar Steel SL. | Spain | Nubledo | Poligono Industrial Cancienes, S/n | Asturias | 33470 | N/A | 2016 | $235,109,409 | 113 | N/A | N/A | B74405093 |
| 98 | Edp Renovables España Slu | Spain | Oviedo | Plaza del Fresno ((pza. de la Gesta 2)) 2 | Asturias | 33007 | hcenergia.***** | 2001 | $231,973,897 | 265 | N/A | N/A | B91115196 |
| 99 | Generacion Carteia Slu | Spain | Madrid | Paseo Castellana, 259 - A, Torre Cepsa | Madrid | 28046 | cepsa.***** | 2021 | $230,862,456 | 17 | N/A | N/A | B06943237 |
| 100 | Corporacion Acciona Eolica SL | Spain | Madrid | Avenida Gran Via de Hortaleza 1 | Madrid | 28033 | acciona.***** | 2009 | $229,749,799 | 11 | N/A | N/A | B85647634 |